<template>
  <div>
    <!-- 头部部分 -->
    <header class="header">
      <h1>todos</h1>
      <input class="new-todo"
             placeholder="请输入任务名称"
             autofocus
             v-model.trim="todoName"
             @keyup.enter="addList" />
    </header>
  </div>
</template>

<script>
export default {
  data () {
    return {
      todoName: ''
    }
  },
  methods: {
    addList () {
      if (!this.todoName) return alert('内容不能为空')
      this.$emit('addList', this.todoName)
      this.todoName = ''
    }
  }
}
</script>

<style scoped></style>
